1 files changed, 74 insertions, 0 deletions
diff --git a/src/sync/map_bench_test.go b/src/sync/map_bench_test.go
index e6a8badddb..cf0a3d7fde 100644
--- a/src/sync/map_bench_test.go
+++ b/src/sync/map_bench_test.go
@@ -144,6 +144,66 @@ func BenchmarkLoadOrStoreCollision(b *testing.B) {
 	})
 }
 
+func BenchmarkLoadAndDeleteBalanced(b *testing.B) {
+	const hits, misses = 128, 128
+
+	benchMap(b, bench{
+		setup: func(b *testing.B, m mapInterface) {
+			if _, ok := m.(*DeepCopyMap); ok {
+				b.Skip("DeepCopyMap has quadratic running time.")
+			}
+			for i := 0; i < hits; i++ {
+				m.LoadOrStore(i, i)
+			}
+			// Prime the map to get it into a steady state.
+			for i := 0; i < hits*2; i++ {
+				m.Load(i % hits)
+			}
+		},
+
+		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
+			for ; pb.Next(); i++ {
+				j := i % (hits + misses)
+				if j < hits {
+					m.LoadAndDelete(j)
+				} else {
+					m.LoadAndDelete(i)
+				}
+			}
+		},
+	})
+}
+
+func BenchmarkLoadAndDeleteUnique(b *testing.B) {
+	benchMap(b, bench{
+		setup: func(b *testing.B, m mapInterface) {
+			if _, ok := m.(*DeepCopyMap); ok {
+				b.Skip("DeepCopyMap has quadratic running time.")
+			}
+		},
+
+		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
+			for ; pb.Next(); i++ {
+				m.LoadAndDelete(i)
+			}
+		},
+	})
+}
+
+func BenchmarkLoadAndDeleteCollision(b *testing.B) {
+	benchMap(b, bench{
+		setup: func(_ *testing.B, m mapInterface) {
+			m.LoadOrStore(0, 0)
+		},
+
+		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
+			for ; pb.Next(); i++ {
+				m.LoadAndDelete(0)
+			}
+		},
+	})
+}
+
 func BenchmarkRange(b *testing.B) {
 	const mapSize = 1 << 10
 
@@ -213,3 +273,17 @@ func BenchmarkAdversarialDelete(b *testing.B) {
 		},
 	})
 }
+
+func BenchmarkDeleteCollision(b *testing.B) {
+	benchMap(b, bench{
+		setup: func(_ *testing.B, m mapInterface) {
+			m.LoadOrStore(0, 0)
+		},
+
+		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
+			for ; pb.Next(); i++ {
+				m.Delete(0)
+			}
+		},
+	})
+}